It's generally a good idea to uninstall old versions before installing the new ones. I only installed the home plug and I just installed it over my old version without any side effects. Use the other hacks at your own risk (comm manager, dialer, etc) as they may have adverse effects on the 6800. The dialer pulled off the touch had memory leaks for example.

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Treo 600 -> Treo 650 -> Treo 700p -Treo 700wx -> Mogul -> Touch Pro
-You may like to flash, but your phone shouldn't LED Killer
- It's Totally Tabular - HTC 5 & 6-Tab Home Plugins